Snake in the Eagle's Shadow (1978)

Chien Fu (Jackie Chan) is a boy who is used as a janitor at his kung fu school. Fu can't fight and is always getting bullied by the teachers and pupils. One day, an old man helps Fu train in an art of kung fu called the "Snake's Fist". Fu doesn't get bullied again. Then Fu creates his own style and mixes it with the Snake's Fist. His style is based on the movement and actions of a cat. One day, the old man is in trouble by a man who does "The Eagle's Claw", and Fu helps the old man.